Buying a new car soon, need advice about getting a good first try deal

So, I'm not the type of person that loves to haggle. However, I will if I have to.

My question is this: What would a salesperson consider a 'fair' deal coming from a customer? Obviously they are a business and should get some profit from the sale, but I am sure as hell not paying MSRP either.

What percentage off MSRP could I reasonably ask for (without taking into consideration manufacturer incentives)? I was thinking approximately 7.5% off it. BTW the car is an Acura TLX SH-AWD.